METHOD FOR LINING OF PIPES HAVING A MALE THREAD WITH THERMOPLASTIC SHELL

• Main Authors: AJDUGANOVA N.M, STARSHOV M.I, AJDUGANOV V.M
• Format: Patent
• Language: English; Russian
• Published: 10.01.2000
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BLASTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PIPES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

FIELD: pipe lining. SUBSTANCE: thermoplastic shell is introduced inside the pipe, leaving the thermoplastic shell ends projecting from the pipe ends. The projecting ends of the thermoplastic shell are heated to the softening temperature, and flanges are formed from them. Thread is produced on the projecting ends of thermoplastic shell, on its inner surface, and bushes with an external flange, whose diameter does not exceed the inside diameter of the pipe thread, are driven on the thread up to the stop against the end faces of the thermoplastic shell. After heating of the projecting ends of the thermoplastic shell the bushes with a flange are driven right home. Flanges are formed with an outside diameter not exceeding the inside diameter of the pipe thread. The ends of the thermoplastic shell are fixed against longitudinal movement by rings of corrosion- resisting metal located beyond the limits of the pipe thread taper. Bushes with an external flange are made of corrosion-resisting material, for example, corrosion-resisting metal, thermosetting plastics, cermet material and other composite materials. EFFECT: simplified process of manufacture of lined pipes, having a male thread, enhanced protection of pipelines against corrosion. 3 cl, 2 dwg